In 2009, Marine veteran John Thuesen broke into his ex-girlfriend's home, then shot and killed her and her brother. Texas convicted him and sentenced him to death. Thuesen was undeniably involved in combat operations in Iraq. It’s reasonably possible that his post-traumatic stress disorder was not adequately diagnosed by the Veterans Health Administration.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.
And no one knows that better than military service members and we have the pictures to prove it.